i know there is pem base64 x509 rsa in go library ,but how to use them to 
verify a signed xml like this

var xmlstr = Bytes("<?xml version=\"1.0\"?><Receipt Version=\"2.0\" 
CertificateId=\"A656B9B1B3AA509EEA30222E6D5E7DBDA9822DCD\" 
xmlns=\"http://schemas.microsoft.com/windows/2012/store/receipt\";><ProductReceipt
 
PurchasePrice=\"CNY6.0\" PurchaseDate=\"2016-11-08T03:39:04.876Z\" 
Id=\"918cb98b-ed9e-4133-bef0-59992186d6b9\" 
AppId=\"73fa393e-bfcc-4c66-8c19-dfeacf4477b8\" 
ProductId=\"xxxxdiamond1_winstore\" ProductType=\"Consumable\" 
PublisherUserId=\"/uuPdfertpI/uxVEn2adfdGQApbLcuUhTKujcAKOQ=\" 
MicrosoftProductId=\"73fa39de-bfcc-4c66-8c19-98f9cf4477b8\" 
MicrosoftAppId=\"73fa39de-bfcc-4c66-8c19-98f9cf4477b8\" 
ExpirationDate=\"9999-12-31T23:59:59.999Z\" /><Signature 
xmlns=\"http://www.w3.org/2000/09/xmldsig#\";><SignedInfo><CanonicalizationMethod
 
Algorithm=\"http://www.w3.org/TR/2001/REC-xml-c14n-20010315\"; 
/><SignatureMethod 
Algorithm=\"http://www.w3.org/2001/04/xmldsig-more#rsa-sha256\"; 
/><Reference URI=\"\"><Transforms><Transform 
Algorithm=\"http://www.w3.org/2000/09/xmldsig#enveloped-signature\"; 
/></Transforms><DigestMethod 
Algorithm=\"http://www.w3.org/2001/04/xmlenc#sha256\"; 
/><DigestValue>odlAczuG7bdfeaDmm7LHgN6R4tq97l6OpbcSDfj/s=</DigestValue></Reference></SignedInfo><SignatureValue>Yz9GEAtSp0sg9MKMgp2SeujoQZf/UxPF9rNOB1vI40/PaLV2QTst/aq8nmH1WhMDt6ZM6EO8EWCcdiddpUD3yZe2zhvSygA6ra6AkdfeaemhqAS2OtHqGPXNvVWoShiP3Cl13R5HlYVuL/rtGVinhD13M3M0zDfcfPFbNI0K9rMv3sHpVepfSY5El8KguYvheSuksxsYtneeVWk/egRkTM9Y1HwMAwEgtJWVq6q/MnVMScKu3T9ZhzAmW3gxElHpWWAR3yObgiNcjDb2a/kh4SuNnK7Tqng9WNcZrghtwrlh6DZADmf+xdfdutm5K3b2wJLRYZgNuWxteuMoWEeNQ==</SignatureValue></Signature></Receipt>")
i already have a certificate 
var cert Certificate 

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